<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试页面</title>
</head>
<body>
    <h1>Hello PyQt5</h1>
    <h2>Hello PyQt5</h2>
    <h3>Hello PyQt5</h3>
    <h4>Hello PyQt5</h4>
</body>
</html>